CN101154959A - Method for detecting system self-interference in time division duplex wireless honeycomb communication network - Google Patents
Method for detecting system self-interference in time division duplex wireless honeycomb communication network Download PDFInfo
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Abstract
The present invention discloses a method for detecting the system self-interference in the time division duplex wireless cellular communication network, which comprises the steps of: confirming the business area coverage for detecting self-interference; arranging an exclusive transmitting cell in the business area coverage, and other cells are arranged to be receiving cell; arranging a carrier frequency and synchronous measuring frame for all the cells in the business area coverage; arranging time slot in the measuring frame for the transmitting cell in the assigned carrier frequency and at the same time arranging receiving time slot in the measuring frame for all the receiving cells in the assigned carrier frequency; assigning the transmitting time slot to transmit the signal of the cell when the transmitting cell is in the assigned carrier frequency; assigning the receiving time slot in the measuring frame to receive the transmitted signal when the receiving cell is in the assigned carrier frequency; and judging whether a system self-interference generates between the transmitting cell and the receiving cell according to whether a transmitted signal is received by the receiving cell in the receiving time slot. The self-interference of the TDD system can be effectively detected with the method of the invention.
Description
Technical field
The present invention relates to a kind of method of detection system self-interference, relate in particular to the method for system's self-interference in a kind of detection time division duplex (TDD, Time Division Duplex) wireless honeycomb communication network.
Background technology
What is called time division multiple access (TDMA, Time Division Multiple Access) system is meant voice, the data message of distinguishing different user by different time-gap, disturbs to avoid producing between the different user.For the time-division multiple address system that adopts the TDD communication mode; its uplink downlink is shared same frequency resource; between uplink and downlink timeslot, leave enough big protection time slot, to avoid between uplink and downlink timeslot owing to crosstalking that aerial transmission delay causes, as shown in Figure 1.Based on the strict Network Synchronization of the TDMA radio honeycomb communication network of TDD.But after the cellular network construction is finished,, might good transmission path be arranged, similar free space transmission between the base station (path delay surpasses the boundary belt width) of wide apart owing to reasons such as website height, positions.To cause the transmission time slot of two or more base stations of wide apart and the interference between the receiving slot like this, this interference will be referred to as TDD system self-interference.That is to say the signal of A base station, received, cause interference B base station subscriber signal by the receiving slot of B base station.Same B base station can be received by the receiving slot of A base station equally at the signal of transmission time slot emission, causes system's self-interference.This class that produces in the TDD system disturbs the lighter to influence performance, and weight person blocks the receive path that is subjected to interference base station.Though the latter is serious, is easy to be found; Though and the former only influences performance, be difficult to the root of orientation problem.Therefore need when testing mechanism guarantees TDD system self-interference and can in time be found.
Patent EP1629608 proposes the method that a kind of base station self-interference is eliminated.This patent thinks that certain base station transmit signals may be subjected to the reflection of peripheral barrier, causes transmitting being received by the receiving slot of this base station, causes the base station self-interference.Think that under normal conditions if network is made rational planning for, avoid using too high website etc., the self-interference amplitude that causes between base station and the base station is smaller, system's self-interference can not produce network performance and have a strong impact on.
But in actual engineering is arranged net implementation process, be difficult in time find self-interference in case the network planning is unreasonable; And under special landforms situation, for example how about the physical features difference of the base station height above sea level that caused that is uneven in city in this case, evades the self-interference of TDD system.Therefore with regard to the problem of a kind of method of needs to be proposed above solving.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that detects system's self-interference in the time division duplex wireless honeycomb communication network.For TDD time division multi-address cellular communication network system, such as TD-SCDMA, TD-CDMA, 802.16e etc., the method for avoidance system self-interference is a lot, for example adjust antenna towards, angle of declination, transmitting power etc., and the key of problem is the self-interference of detection system how, and accurately location interference and interfered base station.
In order to solve the problems of the technologies described above, the invention provides a kind of method that detects system's self-interference in the time division duplex wireless honeycomb communication network, comprise the steps:
(1) determines to carry out business area coverage for detecting self-interference;
(2) the unique emission sub-district of configuration in described service area scope, other cell configuration is for receiving the sub-district;
(3) be interior all cell configuration carrier frequency and synchro measure frame of described service area scope;
(4) specifying carrier frequency, is the transmission time slot in the emission cell configuration measurement frame, is that all receive the receiving slot in cell configuration measurement frames simultaneously;
(5) carrier frequency is being specified in the emission sub-district, and the transmission time slot in the specified measurement frame is launched the signal of this sub-district;
(6) receive the sub-district and specifying carrier frequency, the receiving slot in the specified measurement frame receives described transmitting;
(7) whether receive described transmitting according to receiving the sub-district at described receiving slot, judge described emission sub-district and receive between the sub-district whether produce system's self-interference.
Wherein, described step (7) transmits if receive, and then launches the sub-district and receive to produce system's self-interference between the sub-district, just otherwise do not produce.
Wherein, further comprise, the transmitting of record emission sub-district, time that transmits and signal strength information, for all sub-districts that receive signal then recorder to the time of signal, the intensity of signal characteristic and signal.Wherein, further comprise, the information that receives signal of described record is reported to operating maintenance module or regional Operation and Maintenance control desk.
Wherein, the described transmission time slot of step (4) is adjacent with receiving slot, and transmission time slot is preceding, receiving slot after, midfeather is the protection bandwidth.
Wherein, described step (5) comprises that further other time slots of measuring in the frame are not launched any signal.
Wherein, described the transmitting of step (5) is known or unknown random sequence.Wherein, described known random sequence is meant that emission sub-district, reception sub-district are known sequences; The random sequence of described the unknown is meant a concentrated sequence of random sequence that constitutes or arrange according to certain rule.
Wherein, described step (6) further comprises, thresholding is set and judges whether described reception sub-district receives this and transmit, if the received signal in receiving slot exceeds some or a plurality of setting thresholdings, then this sub-district receives and transmits, otherwise does not just receive.Wherein, described setting thresholding is the sequence length that falls into receiving slot, or drops into the sequence amplitude of receiving slot, or multiple thresholding according to " with ", " or " combination of logic, described thresholding is calculated by following formula:
The E of R=transmission time slot
b/ N
o,
Wherein, R represents thresholding, E
bRepresent every information bit received power, N
oThe expression noise power spectral density.
The method of system's self-interference in the detection time division duplex wireless honeycomb communication network of the present invention can effectively be found TDD system self-interference, and can accurately location interference and disturbed base station, in time to evade the self-interference of TDD system.
Description of drawings
Fig. 1 is the schematic diagram according to the described TDD communication mode of the embodiment of the invention;
Fig. 2 is the structural representation according to the described TD-SCDMA of the embodiment of the invention 10ms of system frame;
Fig. 3 is the structural representation according to the described TD-SCDMA of the embodiment of the invention 5ms of system frame;
Fig. 4 is the structural representation according to the described time division multi-address cellular communication system of the embodiment of the invention;
Fig. 5 is according to the described schematic flow sheet of Local Area Network to realize that TD-SCDMA system self-interference detects that covers based on single RAN system of the embodiment of the invention;
Fig. 6 is according to the described schematic flow sheet of Local Area Network to realize that TD-SCDMA system self-interference detects that covers based on a plurality of RAN system of the embodiment of the invention.
Embodiment
Below be example just with the TD-SCDMA cellular communication system, describe the embodiment that TDD system self-interference detects in detail.
The structure of time slot of TD-SCDMA as shown in Figures 2 and 3.Basic radio frames is the 10ms frame, and each 10ms radio frames is divided into two 5ms subframes again.Each 5ms subframe comprises 7 burst time slots and a special time slot.Standard code 0 time slot is as descending time slot, and 1 time slot is as ascending time slot.Be called as professional transfer point between the adjacent up-downgoing burst time slot, agreement stipulates that each wireless sub-frame comprises two professional transfer points (referring to TS25.2215A.1).First transfer point is positioned at special time slot, and special time slot is made up of descending pilot frequency time slot (DwPTS) protection bandwidth (GP) and uplink pilot time slot (UpPTS).The protection bandwidth length is 96chips, is used to overcome the interference between the uplink downlink.
Typical cellular mobile network generally includes base station system RAN and two parts of core net CN, with reference to figure 4.RAN and user terminal are set up communication link aloft, finish the two-way transmission of voice, data message.Business datum (voice or data) inserts public network (may be the PSTN network, also may be the Internet network) by core net.Core net CN also is responsible for finishing to functions such as the authentication of validated user and mobile roaming controls.Comprise base station transceiver NODE-B and base station controller RNC among the base station system RAN.In time-division multiple address system, all NODE-B require synchronously, such as being synchronized with gps system.Each base station controller leaves the Operation and Maintenance interface, can attended operation maintenance module OMM.In topological diagram, OMM can set up the route of communicating by letter with a plurality of NODE-B as the centrostigma of single RAN network.OMM is responsible for finishing to functions such as the data configuration of linchpin RAN system and plant maintenances.For the network that disposes a plurality of RNC, can dispose regional Operation and Maintenance control desk LOMC at a plurality of OMM upper levels.In topological diagram, LOMC is as the centrostigma of a plurality of RAN networks, can set up the route of communicating by letter with all NODE-B of hanging under a plurality of RAN system.LOMC be responsible for finishing to have jurisdiction over functions such as the data configuration of a plurality of RAN system and plant maintenance.
For the Local Area Network that single RAN system covers, can be by flow process shown in Figure 5, the detection of realization TD-SCDMA system self-interference.Idiographic flow is as follows:
Step 510:OMM configuration-system self-interference surveyed area scope.
By OMM backstage configuration-system self-interference detection range, it can be whole RAN service area, also can only dispose regional area in the RAN service area (as some geographic areas, because that the landforms characteristics have determined that this zone is influenced by the common-frequency network of adjacent region is less; Perhaps at the region of being concerned about, do rational zone boundary and amplify, assurance common-frequency network traffic interference can be ignored), implement self-interference and detect.Wherein, the configuration of described system business area coverage for detecting self-interference defines following several method: simply usually determine that method is that the self-interference test is carried out in the whole service zone; Another kind of way is the ground characteristics according to the area of coverage, selects relatively independent zone, and this zone and the peripheral network overlapped area of coverage are very little, or are separated by natural cover for defenses such as mountain range, the woods; The third way is to select the zone bigger than test zone scope, forms ring-type, and outer shroud is the test section, and interior ring is Validity Test district (only carrying out interference analysis with the data of interior ring), and inner and outer ring radius difference can be considered more than 2 times of base station covering radiuss.
Step 520: in the regional extent by the appointment in step 510 of OMM backstage, dispose unique emission sub-district successively, other cell configuration is for receiving the sub-district.Wherein, the selected of described emission sub-district is that the sub-district in the effective area of coverage (ring-type area of coverage situation) or the test area of coverage (the non-annularity area of coverage) is selected successively, up to all sub-districts of traversal.
Step 530: by the OMM backstage is all cell configuration carrier frequency and synchro measure frame (zero-time of this frame is synchronous) in the detection range.
Definite principle of measuring frame number is: the reliability requirement that satisfies input.At least need to dispose 1 frame, also multiframe can be set, make self-interference according to the multiframe testing result and judge.If it is a plurality of to measure the frame configuration, the selection of a plurality of measurement frames can be continuous, also can select some measurement frames at random in following period of time.
Step 540:OMM configuration transmission time slot and receiving slot.
By the appointment carrier frequency of OMM backstage configuration, specifying the DwpTS time slot in the emission cell measurement frame is transmission time slot, measures other time slots of frame and does not launch any signal; All DwPTS+GP+UpPTS that receive in the cell measurement frame are receiving slot.If emission information source repeat its transmission in transmission time slot, transmission time slot can be identical with receiving slot so; If the emission information source is not a repeat its transmission, consider emission delay, receiving slot is then greater than transmission time slot, if promptly transmission time slot is DwPTS, receiving slot just is set to DwPTS+GP+UpPTS so.
Step 550:OMM sends configuration information to the RAN system.
Self-interference in the step 560:RAN system control implementation system detects.
Carrier frequency is being specified in the emission sub-district, and the transmission time slot in the specified measurement frame is launched the pilot signal of this sub-district.Carrier frequency is being specified in other sub-district in the service area, and the receiving slot in the specified measurement frame receives the signal of this emission, and carries out demodulation to the received signal.By being set, thresholding judges whether receive signal.Calculate as follows: the E of R=transmission time slot
b/ N
o, the R in the formula represents thresholding, E
bRepresent every information bit received power, N
oThe expression noise power spectral density.The setting thresholding of R is 10dB, if detected R value surpasses 10dB, then thinks to receive signal; Otherwise think and do not receive signal.If there is indivedual receptions sub-district to receive signal at the UpPTS time slot, illustrate to produce system's self-interference between emission sub-district and this reception sub-district, need carry out network optimization adjustment.
Step 570:RAN system reports OMM with testing result.
The pilot signal of record emission sub-district, information such as the time of emission pilot signal and intensity.Receive the time of the sub-district recorder of this pilot signal to signal for all, the pilot frequency sequence that demodulates and the intensity of received signal send to OMM.
Step 580: whether travel through all sub-districts to be checked, if, then finish, if not, step 520 entered.Repeating step 520～570, all sub-districts in detection range all once were assigned as the emission sub-district.
Present embodiment only is that a kind of self-interference at single RAN network of explanation detects implementation.Wherein emission, receiving slot configuration mode, threshold setting value etc. include multiple, all in this patent protection range.Realize conveniently that such as considering also can dispose the transmission time slot of UpPTS for the emission sub-district, the receiving slot width configuration is UpPTS+GP+UpPTS; Consider concrete environmental characteristic, judge that the received signal threshold setting is 9dB or 11dB or the like.
For the Local Area Network that a plurality of RAN system covers, can be by flow process shown in Figure 6, the detection of realization TD-SCDMA system self-interference.
Step 610:LOMC configuration-system self-interference surveyed area scope
By LOMC backstage configuration-system self-interference detection range.Can be in whole many RAN service area network range, also can only dispose regional area in many RAN service area (as some geographic areas, because that the landforms characteristics have determined that this zone is influenced by the common-frequency network of adjacent region is less; Perhaps at the region of being concerned about, do rational zone boundary and amplify, assurance common-frequency network traffic interference can be ignored), implement self-interference and detect.Wherein, method identical with described in the step 510 determined in the configuration of described system business area coverage for detecting self-interference.
Step 620:LOMC backstage in the scope of appointed area, disposes unique emission sub-district by a plurality of OMM backstage successively, specifies other sub-district for receiving the sub-district.Wherein, the selected of described emission sub-district is that the sub-district in the effective area of coverage (ring-type area of coverage situation) or the test area of coverage (the non-annularity area of coverage) is selected successively, up to all sub-districts of traversal.
Step 630:LOMC backstage is all cell configuration carrier frequency and a synchro measure frame (zero-time of this frame is synchronous) in the detection range by the OMM backstage.
Definite principle of measuring frame number is to satisfy the minimum requirements of input, needs to dispose 1 frame at least, also multiframe can be set.If it is a plurality of to measure the frame configuration, the selection of a plurality of measurement frames can be continuous, also can select some measurement frames at random in following period of time.
Step 640:LOMC configuration transmission time slot and receiving slot.
Carrier frequency is specified by the configuration of OMM backstage in the LOMC backstage, and specifying the DwPTS time slot in the emission cell measurement frame is transmission time slot, measures other time slots of frame and does not launch any signal; All TSO+UpPTS that receive in the cell measurement frame are receiving slot.If emission information source repeat its transmission in transmission time slot, transmission time slot can be identical with receiving slot so; If the emission information source is not a repeat its transmission, consider emission delay, receiving slot is then greater than transmission time slot, if promptly transmission time slot is DwPTS, receiving slot just is set to DwPTS+GP+UpPTS so.
Step 650:LOMC sends configuration information to a plurality of OMM system.
Step 660:OMM sends configuration information to the RAN system.
Mutual interference in the step 670:RAN system control implementation system detects.
Carrier frequency is being specified in the emission sub-district, and the transmission time slot in the specified measurement frame is launched the pilot signal of this sub-district.Carrier frequency is being specified in other sub-district in the service area, the receiving slot received signal in the specified measurement frame, and carry out demodulation to the received signal.By being set, thresholding judges whether receive signal.Calculate as follows: the E of R=transmission time slot
b/ N
o, the R in the formula represents thresholding, E
bRepresent every information bit received power, N
oThe general density of expression noise power.The setting thresholding of R is 10dB, if detected R value surpasses 10dB, then thinks to receive signal; Otherwise think and do not receive signal.If there is indivedual receptions sub-district to receive signal at the UpPTS time slot, illustrate to produce system's self-interference between emission sub-district and this reception sub-district, need carry out network optimization adjustment.
Step 680:RAN system reports OMM with testing result, and OMM reports LOMC.
The pilot signal of record emission sub-district, LOMC backstage, information such as the time of emission pilot signal and intensity.Receive the time of the sub-district recorder of pilot signal to signal for all, the pilot frequency sequence that demodulates and the intensity of received signal send to corresponding OMM backstage, and the OMM backstage reports LOMC with the information that all sub-districts receive again.
Step 690: whether travel through all sub-districts to be checked, if, then finish, if not, step 620 entered.Repeating step 620～680, all sub-districts in detection range all once were assigned as the emission sub-district.
Present embodiment only is that a kind of self-interference at a plurality of RAN networks of explanation detects implementation.Wherein emission, receiving slot configuration mode, threshold setting value etc. include multiple, all in this patent protection range.Realize conveniently that such as considering also can dispose the transmission time slot of UpPTS for the emission sub-district, the receiving slot width configuration is UpPTS+GP+UpPTS; Consider concrete environmental characteristic, judge that the received signal threshold setting is 9dB or 11dB or the like.
Whether detection TDD system produces self-interference does not need often to carry out, and possible operative scenario comprises: 1. after the network engineering construction finishes, implement at first to get rid of the possibility that network internal produces self-interference before the network optimization; 2. after the network opening operation, because the network capacity extension, newly-increased website is prepared to open before the operation, to be on the safe side, can and may produce the peripheral base station that disturbs to newly-increased base station to newly-increased base station and implement this test.Under a kind of application scenarios in back, need when professional not busy, carry out, such as at midnight or carry out after midnight.
Claims (10)
1. a method that detects self-interference in the time division duplex wireless honeycomb communication network system is characterized in that, comprises the steps:
(1) determines to carry out business area coverage for detecting self-interference;
(2) the unique emission sub-district of configuration in described service area scope, other cell configuration is for receiving the sub-district;
(3) be interior all cell configuration carrier frequency and synchro measure frame of described service area scope;
(4) specifying carrier frequency, is the transmission time slot in the emission cell configuration measurement frame, is that all receive the receiving slot in cell configuration measurement frames simultaneously;
(5) carrier frequency is being specified in the emission sub-district, and the transmission time slot in the specified measurement frame is launched the signal of this sub-district;
(6) receive the sub-district and specifying carrier frequency, the receiving slot in the specified measurement frame receives described transmitting;
(7) whether receive described transmitting according to receiving the sub-district at described receiving slot, judge described emission sub-district and receive between the sub-district whether produce system's self-interference.
2. the method for claim 1 is characterized in that, described step (7) transmits if receive, and then launches the sub-district and receive to produce system's self-interference between the sub-district, just otherwise do not produce.
3. the method for claim 1 is characterized in that, further comprises, transmitting of record emission sub-district, time that transmits and signal strength information, for all sub-districts that receive signal then recorder to the time of signal, the intensity of signal characteristic and signal.
4. method as claimed in claim 3 is characterized in that, further comprises, the information that receives signal of described record is reported to operating maintenance module or regional Operation and Maintenance control desk.
5. the method for claim 1 is characterized in that, the described transmission time slot of step (4) is adjacent with receiving slot, and transmission time slot is preceding, receiving slot after, midfeather is the protection bandwidth.
6. the method for claim 1 is characterized in that, described step (5) comprises that further other time slots of measuring in the frame are not launched any signal.
7. the method for claim 1 is characterized in that, described the transmitting of step (5) is known or unknown random sequence.
8. method as claimed in claim 7 is characterized in that, described known random sequence is meant that emission sub-district, reception sub-district are known sequences; The random sequence of described the unknown is meant a concentrated sequence of random sequence that constitutes or arrange according to certain rule.
9. the method for claim 1, it is characterized in that, described step (6) further comprises, thresholding is set and judges whether described reception sub-district receives this and transmit, if the received signal in receiving slot exceeds some or a plurality of setting thresholdings, then this sub-district receives and transmits, otherwise does not just receive.
10. method as claimed in claim 9, it is characterized in that described setting thresholding is the sequence length that falls into receiving slot, or drop into the sequence amplitude of receiving slot, or multiple thresholding according to " with ", " or " combination of logic, described thresholding is calculated by following formula:
The E of R=transmission time slot
b/ N
o,
Wherein, R represents thresholding, E
bRepresent every information bit received power, N
oThe expression noise power spectral density.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015135197A1 (en) * | 2014-03-14 | 2015-09-17 | 华为技术有限公司 | Device and method for interference elimination |
| CN105191188A (en) * | 2012-11-09 | 2015-12-23 | 瑞典爱立信有限公司 | Systems and methods for mitigating self-interference |
| CN106879012A (en) * | 2017-04-28 | 2017-06-20 | 珠海市魅族科技有限公司 | The method of cell measurement, terminal device and storage medium |
| CN110798854A (en) * | 2018-08-03 | 2020-02-14 | 上海华为技术有限公司 | Clock state detection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1681775A3 (en) * | 2000-03-15 | 2008-12-03 | Interdigital Technology Corporation | Multi-user detection using an adaptive combination of joint detection and successive interference cancellation |
| US7151755B2 (en) * | 2002-08-23 | 2006-12-19 | Navini Networks, Inc. | Method and system for multi-cell interference reduction in a wireless communication system |
| US6788253B1 (en) * | 2003-09-29 | 2004-09-07 | Lucent Technologies Inc. | Method and apparatus for use in improving accuracy in geo-location estimates |
| CN100401646C (en) * | 2004-09-24 | 2008-07-09 | 大唐移动通信设备有限公司 | Multi region combined detection method of time gap code division multi address system |
| CN1816198A (en) * | 2005-01-31 | 2006-08-09 | 西门子（中国）有限公司 | Method for reducing small-region interference in time-division synchronous CDMA accessing system |
| CN100518357C (en) * | 2006-02-14 | 2009-07-22 | 信息产业部电信传输研究所 | System and method of testing effects of interference between mobile communication systems |
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2006
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105191188A (en) * | 2012-11-09 | 2015-12-23 | 瑞典爱立信有限公司 | Systems and methods for mitigating self-interference |
| CN105191188B (en) * | 2012-11-09 | 2018-03-30 | 瑞典爱立信有限公司 | System and method for mitigating self-interference |
| WO2015135197A1 (en) * | 2014-03-14 | 2015-09-17 | 华为技术有限公司 | Device and method for interference elimination |
| US9847808B2 (en) | 2014-03-14 | 2017-12-19 | Huawei Technologies Co., Ltd. | Apparatus and method for interference cancellation |
| CN106879012A (en) * | 2017-04-28 | 2017-06-20 | 珠海市魅族科技有限公司 | The method of cell measurement, terminal device and storage medium |
| CN106879012B (en) * | 2017-04-28 | 2019-03-01 | 珠海市魅族科技有限公司 | Method, terminal device and the storage medium of cell measurement |
| CN110798854A (en) * | 2018-08-03 | 2020-02-14 | 上海华为技术有限公司 | Clock state detection method and device |
| CN110798854B (en) * | 2018-08-03 | 2021-10-26 | 上海华为技术有限公司 | Clock state detection method and device |
| US11832202B2 (en) | 2018-08-03 | 2023-11-28 | Huawei Technologies Co., Ltd. | Clock state detection method and apparatus |
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| CN101154959B (en) | 2010-12-08 |
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